msm: board-8930: Add LED trigger for Backlight control.

The WLED trigger to control the backlight will be triggered
by the display driver.

Change-Id: Ib3daa8caabf9884acdef7d7f71ad008079cf07c4
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
3 files changed